Enter the numeric value very carefully below, rounding to one decimal place only. Do not put the units in, but think about what the
units are!

Molecular Properties / Structure |

Stoichiometry

Bonding : DetermineStructure (8 Variations)H
A substance is analyzed and found to contain 57.10% carbon, 4.80% hydrogen and 38.06% oxygen by weight. Its molecular weight is determined to be 126.11 g/mol. Which of the structures shown are possible structures for the substance?

Interactive Demonstrations for Mole Ratios and Limiting ReagentsCrystal Wood and Bryan BreyfogleThe objective of this study was to develop interactive lecture demonstrations based on conceptual-change learning theory. Experimental instruction was designed for an introductory chemistry course for nonmajors to address misconceptions related to mole ratios and limiting reagentsWood, Crystal; Breyfogle, Bryan. J. Chem. Educ.2006, 83, 741.

Learning Theories |

Reactions |

Stoichiometry |

Student-Centered Learning

Evaluating Students' Conceptual Understanding of Balanced Equations and Stoichiometric Ratios Using a Particulate DrawingMichael J. SangerA total of 156 students were asked to provide free-response balanced chemical equations for a classic multiple-choice particulate-drawing question first used by Nurrenbern and Pickering. The balanced equations and the number of students providing each equation are reported in this study. The most common student errors included a confusion between the concepts of subscripts and coefficients and including unreacted chemical species in the equation. Sanger, Michael J. J. Chem. Educ.2005, 82, 131.

Stoichiometry |

Kinetic-Molecular Theory

Empirical Formulas and the Solid State: A ProposalWilliam B. JensenThis brief article calls attention to the failure of most introductory textbooks to point out explicitly the fact that nonmolecular solids do not have molecular formulas and suggests some practical remedies for improving textbook coverage of this subject. The inadequacies of the terms "empirical formula" and "molecular formula" are also discussed, and the terms "relative compositional formula" and "absolute compositional formula" are proposed as more appropriate alternatives. Jensen, William B. J. Chem. Educ.2004, 81, 1772.